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In page Nixie tube:

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Citing dissatisfaction with the aesthetics of modern digital displays and a nostalgic fondness for the styling of obsolete technology, significant numbers of electronics enthusiasts have shown interest in reviving Nixies.[1] Unsold tubes that have been sitting in warehouses for decades are being brought out and used, the most common application being in homemade digital clocks.[2][3][4] During their heyday, Nixies were generally considered too expensive for use in mass-market consumer goods such as clocks.[4] This recent surge in demand has caused prices to rise significantly, particularly for large tubes, making small-scale production of new tubes financially viable.[citation needed]